mongodb - 使用 Mongo Java 驱动程序（3.x）从 Mongo DB 查询后为 Java 变量赋值

Question

如何使用 Mongo Java Driver 将从 MongoDB 查询的值分配给 Java 中的变量？

int usr1count;
      MongoClient mongoClient = new MongoClient("localhost", 27017);
            MongoDatabase mongoDatabase = mongoClient.getDatabase("testdb3");
            MongoCollection mongoCollection = mongoDatabase.getCollection("sample");
            mongoCollection.drop();
            mongoCollection.insertOne(new Document("_id","usr1").append("count", 1));
            mongoCollection.insertOne(new Document("_id","usr2").append("count", 1));
            mongoCollection.insertOne(new Document("_id","usr3").append("count", 1));
            BasicDBObject query = new BasicDBObject("_id", "usr1");
            FindIterable<Document> fi=mongoCollection.find();
            fi.forEach(new Block<Document>() {
                @Override
                public void apply(final Document document) {
                    Integer.parseInt(document.getString("count").toString());
                }
            });     

从数据库查询后，我必须为 usr1count(variable) 分配一个值。如何分配存在于 Integer.parseInt(document.getString("count").toString()); 中的值